The derrick major constituted a region of Coruscant, characterized by the presence of cargo docks located beneath it.
The docks under the derrick major served as a site for the handling of shipping containers, involving the loading and unloading processes, and were equipped with a multitude of cranes extending from the side of a structure.
In real-world terminology, a derrick refers to a tower or mast-like structure designed for hoisting heavy objects.